Stellar Metallicity of the Extended Disk and Distance of the Spiral Galaxy NGC 3621

Abstract

Low resolution ESO VLT/FORS spectra of blue supergiant stars are analyzed to determine stellar metallicities (based on elements such as Fe, Ti, Mg) in the extended disk of the spiral galaxy NGC3621. Mildly subsolar metallicity (-0.30 dex) is found for the outer objects beyond 7 kpc independent of galactocentric radius and compatible with the absence of a metallicity gradient confirming the results of a recent investigation of interstellar medium HII region gas oxygen abundances. The stellar metallicities are slightly higher than those from the HII regions when based on measurements of the weak forbidden auroral oxygen line at 4363 AE but lower than the ones obtained with the R23 strong line method. It is shown that the present level of metallicity in the extended disk cannot be the result of chemical evolution over the age of the disk with the present rate of in situ star formation. Additional mechanisms must be involved. In addition to metallicity, stellar effective temperatures, gravities, interstellar reddening, and bolometric magnitudes are determined. After application of individual reddening corrections for each target the flux-weighted gravity-luminosity relationship of blue supergiant stars is used to obtain a distance modulus of 29.07+/-0.09 mag (distance D=6.52+/-0.28 Mpc). This new distance is discussed in relation to Cepheid and tip of the red giant branch distances.

arXiv commentAccepted for publication by ApJ, 11 pages, 14 figures, 3 tables

References in corpus (43)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• The chemical composition of the Sun
• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• Final Results from the Hubble Space Telescope Key Project to Measure the Hubble Constant
• Metallicity Calibrations and the Mass-Metallicity Relation for Star-Forming Galaxies
• Star Formation Histories, Abundances and Kinematics of Dwarf Galaxies in the Local Group
• High-Resolution Rotation Curves and Galaxy Mass Models from THINGS
• The ACS Nearby Galaxy Survey Treasury
• The 1000 Brightest HIPASS Galaxies: HI Properties
• Stellar evolution with rotation XI: Wolf-Rayet star populations at different metallicities
• Age and Metallicity Distribution of the Galactic Bulge from Extensive Optical and Near-IR Stellar Photometry
• Extremely Inefficient Star Formation in the Outer Disks of Nearby Galaxies
• Tip of the Red Giant Branch Distances. II. Zero-Point Calibration
• Extragalactic chemical abundances: do HII regions and young stars tell the same story? The case of the spiral galaxy NGC 300
• The Effect of Metallicity on Cepheid-Based Distances
• The flat oxygen abundance gradient in the extended disk of M83
• Biases in abundance derivations for metal-rich nebulae
• Gas Metallicities in the Extended Disks of NGC 1512 and NGC 3621. Chemical Signatures of Metal Mixing or Enriched Gas Accretion?
• Quantitative Spectroscopy of 24 A supergiants in the Sculptor galaxy NGC 300: Flux weighted gravity luminosity relationship, metallicity and metallicity gradient
• The spectroscopic Hertzsprung-Russell diagram
• A VLT study of metal-rich extragalactic H II regions. I. Observations and empirical abundances
• Chemical abundances in M31 from HII regions
• Quantitative Spectroscopy of BA-type Supergiants
• Quantitative Spectroscopy of Blue Supergiant Stars in the Disk of M81: Metallicity, Metallicity Gradient and Distance
• A new extragalactic distance determination method using the flux-weighted gravity of late B and early A supergiants
• Variable Stars in Leo A: RR Lyraes, Short-period Cepheids, and Implications on Stellar Content
• VLT spectroscopy of blue supergiants in IC 1613
• On the O/H, Mg/H, Si/H and Fe/H Gas and Dust Abundance Ratios in Galactic and Extragalactic H II Regions
• Metal Transport to the Gaseous Outskirts of Galaxies
• The Araucaria Project: the Local Group Galaxy WLM--Distance and metallicity from quantitative spectroscopy of blue Supergiants
• The Araucaria Project. VLT spectra of blue supergiants in WLM: classification and first abundances
• A New Distance to M33 Using Blue Supergiants and the FGLR Method
• The ARAUCARIA project: Grid-Based Quantitative Spectroscopic Study of Massive Blue Stars in NGC55
• The ARAUCARIA Project: VLT-FORS spectroscopy of blue supergiants in NGC 3109 - Classifications, first abundances and kinematics
• Quantitative Spectroscopy of Blue Supergiants in Metal-Poor Dwarf Galaxy NGC 3109
• The extra-galactic Cepheid distance scale from LMC and Galactic period-luminosity relations
• Characteristics and classification of A-type supergiants in the Small Magellanic Cloud
• Stellar spectroscopy far beyond the Local Group
• On the Nature of Star Formation at Large Galactic Radii
• The Extragalactic Distance Scale Key Project VIII. The Discovery of Cepheids and a New Distance to NGC 3621 Using the Hubble Space Telescope
• Calibration of the distance scale from galactic Cepheids:II Use of the HIPPARCOS calibration
• A Direct Stellar Metallicity Determination in the Disk of the Maser Galaxy NGC4258
• Multiple ionisation sources in HII regions and their effect on derived nebular abundances

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